Transmission Constraints & Transmission Constraints & Regulation & Power ReserveRegulation & Power Reserve

Managing ConceptManaging Concept

ContentContentPer 1-1-2001Per 1-1-2001

Emergency PowerEmergency PowerBidsBids

Transmission capacityTransmission capacityAGCAGC

CodesCodesCoordination by Coordination by TenneTTenneT

Points of AttentionPoints of Attention

Per 1-1-2001Per 1-1-2001

• mandatory bidding for all connected mandatory bidding for all connected parties with contracted capacity>60MWparties with contracted capacity>60MW- for producersfor producers::

- all that can be produced more or lessall that can be produced more or less- for consumersfor consumers::

- all consumption that can be reducedall consumption that can be reduced- kWh-price freekWh-price free

• For 2002 there is 275 MW For 2002 there is 275 MW regulating regulating power for secondary control power for secondary control and 300 and 300 MW emergency power contractedMW emergency power contracted

Emergency PowerEmergency Power• types:types:

- dedicated gasturbinesdedicated gasturbines- load reductionload reduction- assistence from neighbouring TSOassistence from neighbouring TSO

• used if suited reserve power is not availableused if suited reserve power is not available

• use leads to at least 10% increase of imbalance priceuse leads to at least 10% increase of imbalance price

• Notification if amount RRV with call on time 15 min < n-1Notification if amount RRV with call on time 15 min < n-1

• Notification at start and end of dispatchNotification at start and end of dispatch

Bids (1)Bids (1)

• 2 sorts : regulating power and reserve 2 sorts : regulating power and reserve powerpower

• bid is power option to be delivered when bid is power option to be delivered when called or dispatched by TenneTcalled or dispatched by TenneT

• calling of bid implies energy transaction calling of bid implies energy transaction with with TenneTTenneT (=> correction of E- (=> correction of E-programme)programme)

Bids (1a)Bids (1a)

• first bid until 1 hour after closure of day-first bid until 1 hour after closure of day-ahead market (day before 13h00)ahead market (day before 13h00)

resolve T-constraintsresolve

T-constr.first bid

13h0012h00

day before

16h00

(fiat)

change bids

u-1 u

day of execution

• changeschanges possiblepossible betweenbetween fiat (da fiat (dayy before16h00)before16h00) aanndd closure of closure of markmarkeet t ((11 houhour r before execution hourbefore execution hour))

Bids (2)Bids (2)

• bids per supplier, per sort and bids per supplier, per sort and network areanetwork area

• dispatch/call per supplier, per sort, dispatch/call per supplier, per sort, per network area (latter only for per network area (latter only for resolving transmission constraints)resolving transmission constraints)

• downward reserve is partially callabledownward reserve is partially callable

• 5 MW < bid < 100 MW5 MW < bid < 100 MW

Bids (3)Bids (3)

• can allways be calledcan allways be called

• volume restricted and not surevolume restricted and not sure

• delivery is not sure and can not be delivery is not sure and can not be directly monitoreddirectly monitored

• non-delivery leads to imbalance for non-delivery leads to imbalance for energy responsible party, penalised energy responsible party, penalised through price for imbalancethrough price for imbalance

• additional penalties for contractsadditional penalties for contracts

Bids (4)Bids (4)

system imbalance

SO sells

B

SO delivered in imbalance ->

SO buys

A

<- SO received in imbalance

PQ

imbalance price for shortage0,15

SO <-> PV

SO <-> LRR

0

0kWh

NLG/kWh

Bidirectional dispatchavailable reserve

up -><- down

0,13dispatch price upward reservedispatch price upward reserve

0,06dispatch price downward reservedispatch price downward reserve

imbalance price for surplus0,040,02 incentive

PV = Program ResponsibleLRR = Supplier of Regulation and Reserve Power

Bids (4a)Bids (4a)

0,13

System imbalance

SO sells

B

SO delivered in imbalance ->

SO buys

A

<- SO received in imbalance

P

imbalance price for shortage0,15

SO <-> PV

SO <-> LRR

0

0kWh

NLG/kWh

Unidirectional dispatchAvailable reserve

up -><- down

dispatch price upward reservedispatch price upward reserve

imbalance price for surplus0,11

0,02 incentive

PV = Program ResponsibleLRR = Supplier of Regulation and Reserve Power

Bids (4b)Bids (4b)

0,10

SO sells

B

SO delivered in imbalance ->

SO buys

A

<- SO received in imbalanceSO <-> PV

SO <-> LRR

0

0kWh

NLG/kWh

No reserve dispatchedAvailable reserve

dispatch up -><- dispatch down

price for up/down dispatchprice for up/down dispatch

imbalance price for shortage0,12

0,02 incentive

imbalance price for surplus0,08

PV = Program ResponsibleLRR = Supplier of Regulation and Reserve Power

Bids (4c)Bids (4c)

0,16

System imbalance

SO sells

B

SO delivered in imbalance ->

SO buys

<- SO received in imbalance

P

price for upward dispatchprice for upward dispatch0,200,20

SO <-> PV

SO <-> LRR

0

0kWh

NLG/kWh

Emergency power dispatchedAvailable reserve

dispatch up -><- dispatch down

dispatch price upward reservesdispatch price upward reserves

imbalance price for surplus0,18

0,02 incentive

== price of emergency powerprice of emergency power

imbalance price for shortage0,22

emergency power

PV = Program ResponsibleLRR = Supplier of Regulation and Reserve Power

Bids (6)Bids (6)

Publication of prices (www.tennet.org)Publication of prices (www.tennet.org)

• before:before:- selected points on bidpriceladderselected points on bidpriceladder- first time asap after receival of first bids first time asap after receival of first bids

on day before (shortly after 13h00)on day before (shortly after 13h00)- updates as often as practicalupdates as often as practical

• after:after:- realised imbalance prices for shortage realised imbalance prices for shortage

and surplusand surplus

Transmission capacity (1)Transmission capacity (1)

• network administrator is responsiblenetwork administrator is responsible

• network administrator can restrict network administrator can restrict transmission after resolving transmission after resolving transmission constraints transmission constraints (Principle lies at the (Principle lies at the

root in Electricity-act section.24 lid 2, change in the root in Electricity-act section.24 lid 2, change in the

codes in preparation)codes in preparation)

• local energy balance period (T-local energy balance period (T-programme) remains 1 hprogramme) remains 1 h

Transmission capacity (2)Transmission capacity (2)

• for AGC selected regulating power is for AGC selected regulating power is available within (n-1)available within (n-1)

• other regelating power, reserve other regelating power, reserve power and emergency power for power and emergency power for system service available up to (n-0)system service available up to (n-0)

• reserve power for resolving reserve power for resolving transmission constraints available transmission constraints available up to (n-1)up to (n-1)

Transmission capacityTransmission capacity (3) (3)

• Bids can be used to solve transmission Bids can be used to solve transmission constraints by TenneT constraints by TenneT

• Dispatched bids TenneT will make a Dispatched bids TenneT will make a correction on the imbalancecorrection on the imbalance

• sends out delta’s to suppliers of regulating power, not setpoints sends out delta’s to suppliers of regulating power, not setpoints

to regulating unitsto regulating units

• facilitates own secondary power control system for suppliersfacilitates own secondary power control system for suppliers

• selected regulating power bids available within (n-1) network selected regulating power bids available within (n-1) network

securitysecurity

• Regulating power is selected after market closureRegulating power is selected after market closure

• contracted Regulating power is always dispatched by the AGCcontracted Regulating power is always dispatched by the AGC

• Not-contracted Regulating power if not selected for the AGC is Not-contracted Regulating power if not selected for the AGC is

available as reserve power to solve transmission constraintsavailable as reserve power to solve transmission constraints

AGCAGC

• connected parties >60 MW are connected parties >60 MW are obliged to bid all available reserve obliged to bid all available reserve power to power to TenneTTenneT

• TenneTTenneT can use this power for can use this power for resolving transmission constraints or resolving transmission constraints or for maintaining system balancefor maintaining system balance

Relevant Code ChangesRelevant Code Changes

Coordination of transmission Coordination of transmission constraint by constraint by TenneTTenneT

• energy program responsible parties (EPR) energy program responsible parties (EPR) supply T-programmessupply T-programmes

• connected parties offer regulation and reserve connected parties offer regulation and reserve powerpower

• network operator signals constraintnetwork operator signals constraint

• network operator requests network operator requests TenneTTenneT to to coordinate resolution (total/only coordinate resolution (total/only counteraction) counteraction) - network area, size, period, directionnetwork area, size, period, direction

• TenneTTenneT selects cheapest bids and calls them selects cheapest bids and calls them off off

EndEnd